Check it out, After the video, please download the game in this [url=http://www.moddb.com/mods/the-stanley-parable]Link[/url], and try it out Yourselves.
NOTE: There are many paths and many ways to end the game, The guy from the video did only one path just to show everyone how fun and exciting this half-life 2 mod is.
S.N: I know im late, but this is for the people who ever heard of it. Thank you :)
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Yeah, it's an awesome game.